Starscream prepares to do whatever it takes to convince Galvatron the threat of Unicron is real.

As Unicron begins to awaken, Optimus and Galvatron decide to forgo their battle.

Children unwittingly reopen an ancient battle between Autobots and Decepticons.

The Decepticons gain access to the Autobot base and attempt to take the other two minicons.

Enthusiastic young Sideswipe joins the team and Optimus tasks Hot Shot with training him.

Desperate to make amends to his old friend, Hot Shot allows Wheeljack to shoot him, but this isn't enough.

Hot Shot and Red Alert are sucked through a wormhole.

The Decepticons capture all the children to use as hostages in exchange for the Autobots's minicons.

The only way to defeat Unicron is to wake the minicons inside him and attack from within as well as without.

Alex, Rad and Carlos find the cargo hold of the Exodus underground and are adopted by three minicons.

Grabbing onto Megatron at the end of a battle, Hot Shot and Sideways are transported to the moon.

Starscream challenges Megatron for control of the Decepitcons.

Hearing Megatron say he is nothing more than disposable cannon fodder, Starscream defects with the Star Sabre.

On the moon, Thrust continues his plotting with Megatron.

Megatron sacrifices Starscream, leaving him to face the Autobots alone.

Starscream trusts Thrust and returns to the moon base.

Optimus and Jetfire attack the ship, but can't stop the Hydra Cannon being deployed.

The 'Bots reach Cybertron to find Megatron (now calling himself Galvatron) already winning the war.

While the battle continues, Hot Shot goes to Cybertron to try to convince Galvatron of the impending danger.

Thrust joins Sideways by passing through a portal underground.

With Optimus damaged and temporarily out of commission, the newly-arrived Jetfire takes command.

Alexis tracks a minicon in the vicinity of Mars.

While the Axalon chases the Decepticon ship, hundreds of minicons appear.

A new transformer enters the solar system.

The massive Tidalwave joins the Decepticons, but is, seemingly, defeated in battle by Hot Shot and Blurr.